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Adele Diamond, Meredith B. Prevor, Glenda Callender, Donald P. Druin, Prefrontal Cortex Cognitive Deficits in Children Treated Early and Continuously for PKU, Monographs of the Society for Research in Child Development, Vol. 62, No. 4, Prefrontal Cortex Cognitive Deficits in Children Treated Early and Continuously for PKU (1997), pp. i+iii+v+1-206
Diamond et al. (Wed,) studied this question.